Response of OH, O2 and OI5577 airglow emissions to the mesospheric bore in the equatorial region of Brazil Original Research Article

An all-sky CCD imager capable of measuring wave structure in the airglow OH, O2 and OI (557.7 nm) emissions was operated in the equatorial region at São João do Cariri (Cariri), Brazil (7°S, 36°W), in collaboration with the Instituto Nacional de Pesquisas Espaciais (INPE). Occurrence of mesospheric bore events was studied using the data from September 2000 to September 2002. Sixty-four bore events were detected during the observation period. Most of the bores showed the complementary effects suggested by Dewan and Picard [E.M. Dewan, R.H. Picard, Mesospheric bores. Journal of Geophysical Research 103, 6295–6305, 1998], except in a few cases where the relative variations were inconsistent with this model.